android-检测耳机的插入和拔出动作

转载： http://blog.youkuaiyun.com/shaojie519/article/details/7341793

在android系统中，检测耳机的插入和拔出，也是通过广播实现的，可以建立一个Broadcast Receiver 监听"android.intent.action.HEADSET_PLUG" 这个Intent。

在这个Intent中包含以下几个值：

• state ---      0代表拔出，1代表插入
• name--- 字符串，代表headset的类型。
• microphone --   1代表这个headset有麦克风，0则没有。

在使用的时候发现直接在AndroidManifest,xml文件中静态注册是无效的

[html] view plain copy print ?

1. <receiver android:name=".HeadsetPlugReceiver">   
2.         <intent-filter>   
3.           <action android:name="android.intent.action.HEADSET_PLUG" android:enabled="true">           </action>   
4.         </intent-filter>   
5.   </receiver>   

<receiver android:name=".HeadsetPlugReceiver">  
        <intent-filter>  
          <action android:name="android.intent.action.HEADSET_PLUG" android:enabled="true">           </action>  
        </intent-filter>  
  </receiver>  

解决办法是在代码中动态注册。

[java] view plain copy print ?

1. import android.app.Activity; 
2. import android.content.IntentFilter; 
3. import android.os.Bundle; 
4.  
5. public class HeadSetActivity extends Activity { 
6.     HeadsetPlugReceiver headsetPlugReceiver;  
7.     /** Called when the activity is first created. */ 
8.     @Override 
9.     public void onCreate(Bundle savedInstanceState) { 
10.         super.onCreate(savedInstanceState); 
11.         setContentView(R.layout.main); 
12.         registerHeadsetPlugReceiver(); 
13.     } 
14.     private void registerHeadsetPlugReceiver(){ 
15.         headsetPlugReceiver  = new HeadsetPlugReceiver (); 
16.         IntentFilter  filter = new IntentFilter(); 
17.         filter.addAction("android.intent.action.HEADSET_PLUG"); 
18.         registerReceiver(headsetPlugReceiver, filter); 
19.     } 
20. @Override 
21. protected void onDestroy() { 
22.     // TODO Auto-generated method stub 
23.     super.onDestroy(); 
24.     unregisterReceiver();  //注销监听 
25. } 
26. private void unregisterReceiver(){ 
27.     this.unregisterReceiver(headsetPlugReceiver); 
28. } 
29. } 

import android.app.Activity;
import android.content.IntentFilter;
import android.os.Bundle;

public class HeadSetActivity extends Activity {
	HeadsetPlugReceiver headsetPlugReceiver; 
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        registerHeadsetPlugReceiver();
    }
    private void registerHeadsetPlugReceiver(){
    	headsetPlugReceiver  = new HeadsetPlugReceiver ();
    	IntentFilter  filter = new IntentFilter();
    	filter.addAction("android.intent.action.HEADSET_PLUG");
    	registerReceiver(headsetPlugReceiver, filter);
    }
@Override
protected void onDestroy() {
	// TODO Auto-generated method stub
	super.onDestroy();
	unregisterReceiver();  //注销监听
}
private void unregisterReceiver(){
	this.unregisterReceiver(headsetPlugReceiver);
}
}

在broadcast Receiver中监听事件：

[java] view plain copy print ?

1. <pre class="java" name="code"> 
2. import android.content.BroadcastReceiver; 
3. import android.content.Context; 
4. import android.content.Intent; 
5. import android.widget.Toast; 
6.  
7. public class HeadsetPlugReceiver extends BroadcastReceiver { 
8.  
9.     @Override 
10.     public void onReceive(Context context, Intent intent) { 
11.         // TODO Auto-generated method stub 
12.          
13.             if(intent.hasExtra("state")){ 
14.                 if(intent.getIntExtra("state", 0)==0){ 
15.                     Toast.makeText(context, "headset not connected", Toast.LENGTH_LONG).show(); 
16.                 } 
17.                 else if(intent.getIntExtra("state", 0)==1){ 
18.                     Toast.makeText(context, "headset  connected", Toast.LENGTH_LONG).show(); 
19.                 } 
20.             } 
21.     } 
22.  
23. } 
24. </pre><br> 
25. <br> 
26. <pre></pre> 
27. <br>